磷素是红壤地区农业生产的最重要的限制因素，因此红壤磷素形态与转化问题的研究，对红壤地区农业生产具有重要意义。

Phosphorus(P) is the limiting factor for agricultural production in red soil regions, so the study about P forms and transports can be meaningful to agricultural production in red soil regions.

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结合编制某市市区污水管网系统专业规划，分析和研究了东南沿海地区类似老城区排水管网系统规划与设计需要注意的几个问题。

In compiling a sewer system program in downtown area, the problems deal with the planning and design of sewer network in old township districts in south east seashore area were discussed.

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本文旨在通过对明清时期大同地区人口与环境问题的初步研究，达到关怀现实、为解决当代社会日益严峻的人口问题提供借鉴的作用。

This article wants to attain the concern of actuality with the period and provides lessons to resolve the increasingly rigorous population problem in contemporary society.

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